The wrens are passerine birds in the mainly New WorldfamilyTroglodytidae. There are about 80 species in about 20 genera. The wrens are called the winter wen in North America, and in Eurasia it is called the wren.[1] Most wrens are about 10 centimetres (4 inches) long, brown (both sexes), and has a short bill that curves slightly down.[1] Its wings are round and it has a short tail.

The Eurasian wren (Troglodytes troglodytes) is a very small bird, and the only member of the wren family Troglodytidae found in Eurasia and Africa (Maghreb). In Britain, it is known simply as 'the wren'.

When this bird is annoyed or excited, its call runs into an emphatic churr, not unlike clockwork running down. Its song is a gushing burst of sweet music, loud and emphatic. It has an enormous voice for its size, ten times louder, weight for weight, than a cockerel. Its song may sometimes be confused for the Dunnock, which has warble that is shorter and weaker. The wren's song also incorporates repeated trill sounds while the Dunnock's does not.